No no no no!
A Cruffler is not a glazed pastry that one can get at the local doughnut
shop, nor is a Cruffler something that an automobile exhaust system specialist
can help you with. Let me back up a bit.

Since 1968,
in order to legally receive a firearm shipped across state lines, the recipient
must possess a valid "Federal Firearms License" issued by the United States
Department of the Treasury, Bureau of Alcohol, Tobacco, and Firearms (BATF).
There are many types of these licenses; for dealers, for manufacturers,
for importers, and for collectors. Of all of them, the collector
license (known as a Type 03 license) is unique in that it does not permit
the licensee to engage in a business, but rather its provisions are specifically
designed to enable the collector. Furthermore, the holder of a Type
03 license is restricted to receiving firearms that have been classifed
by the BATF as "Curios or Relics."
That is, any firearm that was demonstrably manufactured 50 years or more
prior to the current date, and/or is on a special "Curios
or Relics List" published by the BATF.

As a result
of these specializations, the Type 03 Federal Firearms License is known
as the Curios and Relics Federal Firearms License. Abbreviated, this
becomes C&R FFL, or CRFFL. Now, CRFFL, if you were to try to
pronounce it, would come out something like "cruffle." Hence, the
holders of these licenses have taken to referring to themselves as CRFFLers,
or CRUFFLERS. So, we have a whole new lexicon:

CRUFFLER:
Noun. Originally the holder of a Type 03 (C&R) FFL, but now anyone
who has an interest in old, historical, or just plain weird firearms for
which ammunition is usually hard to come by.

CRUFFLE:
Verb. To seek out old, historical, and weird firerams to shoot, study,
admire, and place in historical context. Includes engaging in ceaseless
research, correspondence, and conversation about same. Also requires
a refinement of fiscal priorities (Hmm. . . .I can eat this week, or I
can get that all-matching Norwegian .30-06 conversion K98k. . .).

CRUFFLING:
Active Participle. For a true Cruffler, this is often equated with
breathing. . .